Clarify vocabulary and symbols

The semantic elements through which information is presented – the
words, symbols, numbers, and icons – are differentially accessible to
learners with varying backgrounds, languages, and lexical knowledge. To
ensure accessibility for all, key vocabulary, labels, icons, and symbols
should be linked to, or associated with, alternate representations of
their meaning (e.g., an embedded glossary or definition, a graphic
equivalent, a chart or map). Idioms, archaic expressions, culturally
exclusive phrases, and slang, should be translated.

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Pre-teach vocabulary and symbols, especially in ways that promote connection to the learners’ experience and prior knowledge